CN1274464A - Method of writing tracking servo signal pattern for magnetic disk device - Google Patents
Method of writing tracking servo signal pattern for magnetic disk device Download PDFInfo
- Publication number
- CN1274464A CN1274464A CN99801215A CN99801215A CN1274464A CN 1274464 A CN1274464 A CN 1274464A CN 99801215 A CN99801215 A CN 99801215A CN 99801215 A CN99801215 A CN 99801215A CN 1274464 A CN1274464 A CN 1274464A
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- Prior art keywords
- burst signal
- signal
- tracking servo
- disk
- record
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010586 diagram Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000005347 demagnetization Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 1
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
- G11B5/59688—Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
- G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B5/596—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following on disks
- G11B5/59633—Servo formatting
- G11B5/59655—Sector, sample or burst servo format
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2508—Magnetic discs
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Moving Of The Head To Find And Align With The Track (AREA)
- Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
Abstract
In a method of writing tracking servo signal patterns for a magnetic disk device, a servo track writer for writing tracking servo signals records only a first burst signal (8) and a second burst signal (9). After that, the magnetic head of the magnetic disk device reproduces the first burst signal (8) and the second burst signal (9). The magnetic head of the magnetic disk device then records a third burst signal (10) and a fourth burst signal (11) while the magnetic head position is so controlled that the ratio between the levels of the reproduced signals may become a predetermined value.
Description
Technical field
The present invention relates to write to the disk of disk set the method for tracking servo signal pattern, this disk set is by the concentric circles code track recording/reproducing information of magnetic head to constituting with the regulation track pitch on the disk of rotation driving.
Background technology
In the past, in the disk set of hard disk unit and so on, for in disk with recording/reproducing information on the concentric circles code track of regulation track pitch, the front portion of each sector in a plurality of sectors that the code track of concentric circles is divided into is write down tracking servo signal pattern in advance.
Fig. 4 represents an example of this tracking servo signal pattern.Disk is with the rotation of arrow 500 directions, and the fixing magnetic head of special-purpose magnetic head 12 and write head 14 one of resetting moves along disk diametric(al) 510.Depart from and on the position that code track center line 131 directions are offset mutually along disk diametric(al) 510 mutual reverse directions at relative code track center line 131,132, first burst signal of recording prescribed frequency (burst signal) 81 in advance separately, 82, second burst signal 91,92, the 3rd burst signal 101, the 102 and the 4th burst signal 110,111,112, as tracking servo signal.
Device constitutes to make when information recording/reproducing, reset respectively in first, second, third, fourth burst signal at least two of the special-purpose magnetic head 12 of resetting, and making the level ratio between the replay signal of burst signal of this playback is requirement ratio.The position of write head 14 is limited on one side in the position of special-purpose magnetic head 12 of resetting of control on one side, so as on the code track of stipulating recording/reproducing information.
For example, as shown in Figure 4, for code track center line 131, on the code track that is positioned at first burst signal 81 and second burst signal 91 during recording/reproducing information, reset first burst signal 81 and second burst signal 91, the control head position, making the level ratio of this two burst signal is setting, thereby is normally followed the tracks of.Again, with respect to code track center 132, on the code track that is positioned at the 3rd burst signal 102 and the 4th burst signal 111 during recording/reproducing information, reset the 3rd burst signal 102 and the 4th burst signal 111, the control head position, making the level ratio of the replay signal of this two burst signal is setting, thereby is normally followed the tracks of.
Write the method for disk as the tracking servo signal pattern that this first, second, third and the 4th burst signal is constituted, in the past, use is called the special-purpose writing station of servo magnetic route write device (servo track writer), the one side rotation drives the disk of disk set, simultaneously, the time that one side is controlled the position of the magnetic head of disk set own and record, wiped with the control system of servo magnetic route write device, thereby write down the first, second, third and the 4th burst signal 81,82,91,92,101,102,110,111,112 etc.
With reference to Fig. 5, the tracking servo signal wiring method in the past that adopts servo magnetic route write device is described.
At first, write head 14 is positioned at the position that will write burst signal 81a, writes burst signal 81a.Required time is the time sum that positioning time and disk rotated for 1 week for this reason.Then, write head 14 is positioned to write the position of burst signal 101a, writes burst signal 101a.Required time is the time sum that positioning time and disk rotated for 1 week for this reason.
Then, write head 14 is positioned the position that will write burst signal 91a of disk diametric(al) 510, and the part to the burst signal 81a that write promptly after the demagnetization of 81b part, writes burst signal 91a immediately.Required time still is the time sum that positioning time and disk rotated for 1 week for this reason.Then, write head 14 is positioned the position that will write burst signal 111a of disk diametric(al) 510, writes burst signal 111a immediately after demagnetization 101b part.Required time is the time sum that positioning time and disk rotated for 1 week for this reason.
Then, write head 14 is positioned to write the position of burst signal 82a, after writing burst signal 82a, and demagnetization 91b part immediately.Required time is the time sum that positioning time and disk rotated for 1 week for this reason.
Thereby repeat aforesaid operations and write whole burst signals.Thereby write required time and be shown below.
(positioning time+disk rotates the time in 1 week) * burst signal number
But, used servo magnetic route write device is very expensive device in the above-mentioned wiring method, thereby, wish that this expensive device can effectively utilize, but as mentioned above, because of the first, second, third and the 4th whole burst signals all carry out record under this servo magnetic route write device control, thereby may not necessarily effectively utilize.
The objective of the invention is to, by under the control of servo magnetic route write device control system, write the part tracking servo signal or the special signal of disk set, then, without servo magnetic route write device, and under the control system control of disk set itself, write remaining tracking servo signal, thereby shorten the service time of servo magnetic route write device according to the tracking servo signal that has write.
Invention discloses
Tracking servo signal pattern for magnetic disk device wiring method of the present invention, comprise the steps: under the control of tracking servo signal writing station (servo magnetic route write device) control system, organize in the tracking servo signal one group more by the head records of disk set itself; Then, under the control of the control system of disk set itself, by the magnetic head of disk set itself, the above-mentioned one group of tracking servo signal of resetting; By the control system control of disk set itself, according to replay signal, a control head position, one side is by the magnetic head of disk set itself, and Unrecorded tracking servo signal pattern in the tracking servo signal organized in record more.
According to this method, only write down one group of tracking servo signal, thereby the utilization ratio of servo magnetic route write device is increased at least more than two times with servo magnetic route write device.The tracking servo signal pattern of other group respectively under the control of the control system of disk set itself, carries out record by the magnetic head of disk set itself, thereby needn't consider the utilization ratio of servo magnetic route write device and so on special device specially.
Tracking servo signal pattern for magnetic disk device wiring method of the present invention comprises: under the control system control of tracking servo signal writing station, by head records first burst signal and second burst signal of disk set itself; Then, under the control of the control system of disk set own, by the magnetic head of disk set itself reset this first burst signal and second burst signal; A control head position, one side is by head records the 3rd burst signal and the 4th burst signal of disk set itself, and the level ratio that makes two replay signal is a setting.
According to said method, under the control system control of servo magnetic route write device, only write down first and second burst signals, and the third and fourth burst signal figure, respectively under the control system control of disk set own, magnetic head by disk set itself carries out record, so the utilization ratio of servo magnetic route write device can be increased to more than two times at least.
Summary of drawings
Fig. 1 is in the 1st example of tracking servo signal pattern wiring method of disk set of the present invention, the recording process first half synoptic diagram of record tracking servo signal pattern on disk.
Fig. 2 is the rear section synoptic diagram that writes down the recording process of tracking servo signal pattern on disk of the 1st example.
Fig. 3 A is in the 2nd example of tracking servo signal pattern wiring method of disk set of the present invention, the recording process first half synoptic diagram of record tracking servo signal pattern on disk.
Fig. 3 B is in the 2nd example of tracking servo signal pattern wiring method of disk set of the present invention, the recording process latter half synoptic diagram of record tracking servo signal pattern on disk.
Fig. 4 represents an example of tracking servo signal pattern for magnetic disk device in the past.
Fig. 5 is a tracking servo signal pattern for magnetic disk device wiring method synoptic diagram in the past.
Optimal morphology the 1st example that carries out an invention
With reference to Fig. 1, Fig. 2, the tracking servo signal pattern for magnetic disk device wiring method of the present invention's the 1st example is described.The inscape identical with the prior art example, additional same numeral also omits explanation.
At first, identical with the prior art example, use servo magnetic route write device, the disk of disk set is driven along the rotation of arrow 520 directions, simultaneously, use the special-purpose magnetic head 12 of the incorporate playback that has the assigned position relation mutually and write head 14 of disk set, under servo magnetic route write device control, as shown in Figure 1, in initial first changes with the width record first burst signal 181a of write head 14.Then, along the position of arrow 510 directions change write head 14, in next changes, with the width record second burst signal 191a of write head 14.Its formation is, when this second burst signal of record 191a is rotated, the part of write head 14 is scanned a part of 181b of the first burst signal 181a, eliminates a part of 181b of the first burst signal 181a when scanning, thereby obtains first burst signal 181 of standard servo track width.
Equally, change the position of write head 14, in next changes with the width record first burst signal 182a of write head 14.Its formation is that when this second burst signal of record 182a was rotated, the part of write head 14 was scanned a part of 191b of the second burst signal 191a.When scanning, a part of 191b of the cancellation second burst signal 191a thus, obtains second burst signal 191 of standard servo track width.Repeat said process, under servo magnetic route write device control, assigned position on disk, first burst signal 181,182 of correct recording prescribed servo track width ... with second burst signal 191,192 ...
Then, disk set separates with servo magnetic route write device, under the control system control of disk set itself, by playback head 12 playback first burst signal 181 and second burst signals 191.The position of control playback head 12 makes the level ratio of this two replay signal be respectively requirement ratio, simultaneously by assigned position relation and incorporate write head 14 being arranged with this playback head 12, with with the same order of record first burst signal 181 and second burst signal 191, as shown in Figure 2, write down the 3rd burst signal 201 and the 4th burst signal 211.The 3rd burst signal 201 and first burst signal 181 and second burst signal 191 have the assigned position relation, and the 4th burst signal 211 and first burst signal 182 and second burst signal 192 have the assigned position relation.
That is, its formation is that in first changeed, with width record the 3rd burst signal 201a of write head 14, when being rotated for record the 4th burst signal 211a, the part of write head 14 was scanned a part of 201b of the 3rd burst signal 201a next time.When scanning, a part of 201b of cancellation the 3rd burst signal 201a thus, obtains the 3rd burst signal 201 of standard servo track width.Equally, when being rotated for record the 3rd burst signal 202a, a part of 211b of cancellation the 4th burst signal 211a thus, obtains the 4th burst signal 211 of standard servo track width.Repeat said sequence, can be at the 3rd burst signal 201,202 of the correct recording prescribed servo track of assigned position width ... with the 4th burst signal 211,212 ...
According to this example, only write down first burst signal 181,182 with servo magnetic route write device ... with second burst signal 191,192 ... thereby with also write down the 3rd burst signal 101,102 ... with the 4th burst signal 111,112 ... the prior art example compare, the utilization ratio of servo magnetic route write device is increased to more than two times at least.Again, the 3rd burst signal and the 4th burst signal figure be respectively by the control system record of disk set itself, thereby needn't consider the utilization ratio of special devices such as servo magnetic route write device specially.The 2nd example
Then, with reference to Fig. 3 A, Fig. 3 B, the tracking servo signal pattern wiring method of the disk set of this example 2 is illustrated.
Identical with example 1, under servo magnetic route write device control, record first burst signal 381,382 on disk ... with second burst signal 391,392 ...In this example, at first, in the record first burst signal 381a, record the 3rd burst signal 400a and the 4th burst signal 410a on disk.Required time is the time sum that positioning time and disk rotated for 1 week for this reason.Then, in the record second burst signal 391a, record the 3rd burst signal 401a and the 4th burst signal 411a on disk.Required time still is the time sum that positioning time and disk rotated for 1 week for this reason.
As a result, as shown in Figure 3A, formerly on the part of Ji Lu the 3rd burst signal 400a, duplicate record the then part of the 3rd burst signal 401a of record.And formerly on the part of the 4th burst signal 410 of record, duplicate record the then part of the 4th burst signal 411a of record.Thus, the 3rd burst signal and the 4th burst signal are recorded as separately at the continuous figure of disk diametric(al).In addition, the 3rd burst signal of duplicate record is consistent with the phase place that the 3rd burst signal and the 4th burst signal of the 4th burst signal and precedence record write down.
Thereafter, disk set separates with servo magnetic route write device, under disk set self control system control,, obtain the 3rd burst signal and the 4th burst signal of Rack by not needing part in write head 14 cancellations the 3rd burst signal and the 4th burst signal row graph.Promptly, by playback head 12, reset first burst signal 381 and second burst signal 391, the position of control playback head 12, make this two replay signal level ratio be requirement ratio, by a part of 400b of write head 14 cancellations the 3rd burst signal 400a, shown in Fig. 3 B, can obtain the 3rd burst signal 401 of Rack simultaneously.Equally, a part of 410b of cancellation the 4th burst signal 411a obtains the 4th burst signal 411 of Rack.
Again, reset first burst signal 382 and second burst signal 392, the position of control playback head 12 makes this two replay signal level ratio be requirement ratio, by a part of 402b of write head 14 cancellations the 3rd burst signal 402a, thereby obtains the 3rd burst signal 402 of Rack.Equally, a part of 411b of cancellation the 4th burst signal 412a obtains the 4th burst signal 412 of Rack.Repeat above-mentioned steps, on assigned position, form the 3rd burst signal 401,402 of roughly stipulating the servo track width ... with the 4th burst signal 411,412 ...
In this way, between for example the 3rd burst signal 402 and the 4th burst signal 411,, can produce gap 15 because of the relation of servo track width and write head width in the disk diametric(al).But to compare its width little because of the gap 15 and the width of playback head 12, thereby no problem in the practicality.By making the write head width approach servo track width 2/3, can make gap 15 littler.
According to this example, also available servo magnetic route write device writes down first burst signal 381,382 ... with second burst signal 391,392 ... and on its recording track extended line the record the 3rd burst signal figure 400a, 401a ... with the 4th burst signal figure 410a, 411a ...The 3rd final burst signal 401,402 ... with the 4th burst signal 411,412 ... the control of each comfortable disk set self control system down, wipe and form by magnetic head, thereby needn't consider the service efficiency of special devices such as servo magnetic route write device, the utilization ratio of servo magnetic route write device is increased to more than two times at least.
In the invention process form, be that example is illustrated with one group or two groups of burst signals.But the invention is not restricted to this, much less also can be by this writing station that writes tracking servo signal of servo magnetic route write device, behind at least one group of burst signal of the many groups of record burst signal on the disk, under the control of disk set self control system, by the magnetic head of disk set self, Unrecorded burst signal in a plurality of burst signals of record on disk.
Utilizability on the industry
Using and state bright the present invention, is servo magnetic route write device with expensive device only, record first He Second burst signal, or record first and second burst signals and record on the extended line of its recording track The 3rd burst signal figure and the 4th burst signal figure, thereby the utilization ratio of servo magnetic route write device is extremely Can be increased to more than two times less. Form final by the magnetic head record of separately disk set self or cancellation The 3rd burst signal and the 4th burst signal, thus needn't consider especially the special dresses such as servo magnetic route write device The utilization ratio of putting.
Thus, can seek the rationalization of disk set production process, be conducive to reduce price.
Claims (4)
1. the wiring method of a tracking servo signal pattern for magnetic disk device is characterized in that, it comprises the steps:
Simultaneously control the head position of disk set itself by the tracking servo signal writing station, one side is departing from and on the position that the code track direction is offset mutually one group of tracking servo signal of record on described disk mutually in the disk diametric(al) with respect to the center of code track;
Under described disk set itself control, by the described magnetic head described one group of tracking servo signal of resetting;
According to the replay signal of described one group of tracking servo signal of resetting, under described disk set control itself, control described head position;
By described magnetic head, on described disk, write down tracking servo signal.
2. the wiring method of a tracking servo signal pattern for magnetic disk device, this disk set is on the disk that rotation drives, when carrying out recording/reproducing information with the concentric circles code track of regulation track pitch by magnetic head, control the position of described magnetic head, through described concentric circles code track record and playback information, make playback first burst signal of record as tracking servo signal and in advance, second burst signal, at least two signals in the 3rd burst signal and the 4th burst signal, and to make the level ratio between the replay signal of two burst signals of playback be requirement ratio, described burst signal is recorded in each front portion, sector of a plurality of sectors that described concentric circles magnetic track is divided into respectively, is departing from mutually and on the position that the code track direction is offset mutually in the disk diametric(al) with respect to described code track center; It is characterized in that this method comprises the steps:
Control the head position of described disk set self by the tracking servo signal writing station, simultaneously described first burst signal of record and second burst signal on described disk;
By the described magnetic head of described disk set itself, reset described first burst signal and second burst signal;
By the control head of described disk set position own, make described first tracking servo signal that the described magnetic head of described disk set itself resets and the level ratio of second tracking servo signal be respectively requirement ratio;
By the described magnetic head of described disk set itself, described the 3rd burst signal of record and the 4th burst signal on disk.
3. the wiring method of tracking servo signal pattern for magnetic disk device as claimed in claim 2 is characterized in that, also comprises the steps:
When described first burst signal of record and second burst signal, write down the 3rd burst signal figure and the 4th burst signal figure respectively with width, by the magnetic head of described disk set itself reset described first burst signal and second burst signal more than or equal to regulation record width;
Position by the described magnetic head of described disk set control itself makes the level ratio of two replay signal of described first burst signal and second burst signal be respectively requirement ratio;
Wipe described the 3rd burst signal figure of part and the 4th burst signal figure that writes down Width by the magnetic head of described disk set itself, thus described the 3rd burst signal and the 4th burst signal of recording prescribed record width.
4. the wiring method of tracking servo signal pattern for magnetic disk device as claimed in claim 3 is characterized in that, using described disk diametric(al) record width is the write head of servo track width 2/3, the record tracking servo signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21061998A JP3334628B2 (en) | 1998-07-27 | 1998-07-27 | Method of writing tracking servo signal pattern in magnetic disk drive |
| JP210619/1998 | 1998-07-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1274464A true CN1274464A (en) | 2000-11-22 |
| CN1123005C CN1123005C (en) | 2003-10-01 |
Family
ID=16592335
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99801215A Expired - Fee Related CN1123005C (en) | 1998-07-27 | 1999-07-27 | Method of writing tracking servo signal pattern for magnetic disk device |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US6556370B1 (en) |
| EP (1) | EP1026684B1 (en) |
| JP (1) | JP3334628B2 (en) |
| KR (1) | KR100533403B1 (en) |
| CN (1) | CN1123005C (en) |
| AT (1) | ATE279006T1 (en) |
| DE (1) | DE69920868T2 (en) |
| TW (1) | TW442782B (en) |
| WO (1) | WO2000007188A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305030C (en) * | 2001-06-01 | 2007-03-14 | 希捷科技有限公司 | Vertically-oriented servo track writer and method |
| CN100419859C (en) * | 2005-02-03 | 2008-09-17 | 株式会社东芝 | Magnetic recording apparatus |
| CN113284522A (en) * | 2020-02-20 | 2021-08-20 | 株式会社东芝 | Magnetic disk device and servo strobe generation method |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6600621B1 (en) * | 2000-05-31 | 2003-07-29 | Hitachi Global Storage Technologies Netherlands B.V. | Techniques for multitrack positioning and controlling error growth in self-servowriting systems |
| JP4644356B2 (en) | 2000-11-10 | 2011-03-02 | 株式会社日立グローバルストレージテクノロジーズ | Servo write system for magnetic disk device and magnetic recording / reproducing device |
| KR100459718B1 (en) * | 2002-08-28 | 2004-12-03 | 삼성전자주식회사 | Recording medium in which a program that measures magnetic write width of a head in a hard disk drive is recorded |
| JP4331066B2 (en) * | 2004-07-16 | 2009-09-16 | 株式会社東芝 | Magnetic recording medium, magnetic recording apparatus, and stamper |
| US7175240B2 (en) * | 2004-09-09 | 2007-02-13 | Karl Anthony Fultz | Revolving ornamentation for wheel |
| KR100688506B1 (en) | 2004-11-23 | 2007-03-02 | 삼성전자주식회사 | Self-servo recording method, hard disk drive and recording medium therefor |
| KR100594308B1 (en) * | 2004-12-27 | 2006-06-30 | 삼성전자주식회사 | Method for recording servo pattern on disc and disc drive and magnetic disc using the same |
| JP2008010101A (en) * | 2006-06-30 | 2008-01-17 | Toshiba Corp | Servo writing method and disk storage unit |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5307218A (en) | 1987-03-31 | 1994-04-26 | Kabushiki Kaisha Toshiba | Magnetic disk apparatus using both servo-surface servo and data-surface servo |
| JPH04248172A (en) * | 1991-01-25 | 1992-09-03 | Fuji Electric Co Ltd | Servo signal writing method for hard disk device |
| US6040955A (en) * | 1992-06-11 | 2000-03-21 | International Business Machines Corporation | Self servo writing file |
| JP3440952B2 (en) * | 1993-02-24 | 2003-08-25 | ソニー株式会社 | Data recording method and data reproducing method |
| US5485322A (en) | 1993-03-08 | 1996-01-16 | International Business Machines Corporation | Method and system for writing a clock track on a storage medium |
| JPH0737344A (en) * | 1993-07-21 | 1995-02-07 | Hitachi Ltd | Servo-signal writing method, magnetic disk device and magnetic disk |
| JPH0759495A (en) | 1993-08-19 | 1995-03-07 | New Harima Kk | Artificial shrimp bait |
| JPH07287951A (en) * | 1994-04-15 | 1995-10-31 | Teac Corp | Method for recording servo signal on recording medium |
| JPH0883415A (en) * | 1994-07-15 | 1996-03-26 | Sony Corp | Signal recording and/or reproducing device, signal recording and/or reproducing method and recording medium |
| JP3251804B2 (en) * | 1995-03-17 | 2002-01-28 | 株式会社東芝 | Disk recording / reproducing apparatus and self-servo writing method therefor |
| JPH09320223A (en) * | 1996-05-27 | 1997-12-12 | Mitsumi Electric Co Ltd | Servo data writing method for large-capacity flexible disk and servo writer for large-capacity flexible disk |
| US5991104A (en) * | 1996-11-27 | 1999-11-23 | Seagate Technology, Inc. | Using servowriter medium for quickly written servo-patterns on magnetic media |
| JP3859282B2 (en) * | 1996-12-10 | 2006-12-20 | 富士通株式会社 | Servo pattern writing method of magnetic disk device and magnetic disk device |
| JP3758317B2 (en) * | 1997-07-09 | 2006-03-22 | ソニー株式会社 | Data recording and / or playback device |
| JPH1196703A (en) * | 1997-09-17 | 1999-04-09 | Alps Electric Co Ltd | Disk recorded with servo pattern and method for recording servo pattern |
-
1998
- 1998-07-27 JP JP21061998A patent/JP3334628B2/en not_active Expired - Fee Related
-
1999
- 1999-07-27 US US09/509,276 patent/US6556370B1/en not_active Expired - Lifetime
- 1999-07-27 WO PCT/JP1999/004011 patent/WO2000007188A1/en active IP Right Grant
- 1999-07-27 AT AT99931555T patent/ATE279006T1/en not_active IP Right Cessation
- 1999-07-27 CN CN99801215A patent/CN1123005C/en not_active Expired - Fee Related
- 1999-07-27 KR KR10-2000-7003227A patent/KR100533403B1/en not_active IP Right Cessation
- 1999-07-27 DE DE69920868T patent/DE69920868T2/en not_active Expired - Lifetime
- 1999-07-27 EP EP99931555A patent/EP1026684B1/en not_active Expired - Lifetime
- 1999-08-10 TW TW088112608A patent/TW442782B/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1305030C (en) * | 2001-06-01 | 2007-03-14 | 希捷科技有限公司 | Vertically-oriented servo track writer and method |
| CN100419859C (en) * | 2005-02-03 | 2008-09-17 | 株式会社东芝 | Magnetic recording apparatus |
| CN113284522A (en) * | 2020-02-20 | 2021-08-20 | 株式会社东芝 | Magnetic disk device and servo strobe generation method |
| CN113284522B (en) * | 2020-02-20 | 2022-08-12 | 株式会社东芝 | Magnetic disk device and servo strobe generation method |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1026684A4 (en) | 2003-01-02 |
| DE69920868T2 (en) | 2005-02-03 |
| US6556370B1 (en) | 2003-04-29 |
| KR20010030718A (en) | 2001-04-16 |
| KR100533403B1 (en) | 2005-12-02 |
| ATE279006T1 (en) | 2004-10-15 |
| JP2000048504A (en) | 2000-02-18 |
| TW442782B (en) | 2001-06-23 |
| EP1026684B1 (en) | 2004-10-06 |
| WO2000007188A1 (en) | 2000-02-10 |
| JP3334628B2 (en) | 2002-10-15 |
| CN1123005C (en) | 2003-10-01 |
| DE69920868D1 (en) | 2004-11-11 |
| EP1026684A1 (en) | 2000-08-09 |
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